These threads might be interesting:

http://www.irealb.com/forums/showthr...valid-for-live
http://www.irealb.com/forums/showthr...-gigs-w-Player
http://www.irealb.com/forums/showthr...ter-a-live-gig
http://www.irealb.com/forums/showthr...g-using-Player
(I realise you have OSX version and these were based around iOS.)

For lyrics, although difficult to add to iReal Pro charts, on a Mac you can use part of the screen to show a PDF (or similar) with the lyrics and have this app on top (left side) with iReal Pro in the background, showing the chords (and playing in the background if needed.)